<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script !src="">

  document.write(Math.PI + "<br>")
  document.write(Math.max(12,25,3,6,54)+ "<br>");
  document.write(Math.round(5.12)+ "<br>");
  document.write(Math.round(5.62)+ "<br>");
  document.write(Math.ceil(5.25)+ "<br>");
  document.write(Math.floor(5.95)+ "<br>");
  document.write(Math.random()*100+ "<br>")
  console.log("==================================")
  var zs = new String("zhang san");
  console.log(zs.indexOf('a'))
  console.log(zs.substring('g'))
  console.log(zs.split('\\s'))
  var date = new Date();
  console.log(date.getTime())
  console.log(date.toDateString())
  console.log(date.toLocaleDateString())

</script>
</body>
</html>